index.jsp
1 <%@ page language="java" contentType="text/html; charset=UTF-8" 2 pageEncoding="UTF-8"%> 3 <!DOCTYPE html PUBLIC "-//W3C//DTD HTML 4.01 Transitional//EN" "http://www.w3.org/TR/html4/loose.dtd"> 4 <html> 5 <head> 6 <meta http-equiv="Content-Type" content="text/html; charset=UTF-8"> 7 <title>Insert title here</title> 8 <script type="text/javascript"> 9 window.onload=function(){ 10 //1.获取a节点，并对其添加onclick响就函数 11 document.getElementsByTagName("a")[0].onclick=function(){ 12 //3.创建一个XMLHttpRequest对象 13 var request=new XMLHttpRequest(); 14 //4.准备发送请求的数url,加上时间戳 15 var url=this.href +"?time=" + new Date(); 16 var method="GET"; 17 //5.调用XMLHttpRequest的open方法 18 request.open(method,url); 19 //6.调用XMLHttpRequest的send方法 20 request.send(null); 21 //7.为XMLHttpRequest对象添加onreadystatechange响应函数 22 request.onreadystatechange = function(){ 23 //8.判断响应是否完成：XMLHttpRequest对象的readyState属性为4的时侯 24 if(request.readyState == 4){ 25 //9.再判断响应是否可用：XMLHttpRequest对象status属性值为200 26 if(request.status == 200||request.status == 304){ 27 //10.打印响 应结果：reponseText 28 alert("aaa") 29 alert(request.responseText); 30 } 31 } 32 } 33 //2.取消a节点默认行为 34 return false; 35 } 36 } 37 </script> 38 </head> 39 <body> 40 <a href="test.txt">test helloWord!</a> 41 </body> 42 </html>
test.txt
hello world,the first ajax!